The knight looks pretty on e4, but it can be attacked with f6-f5 and the pressure on c5 isn't dangerous.
10... a8c8  11. e1g1  11... a7a6  12. b5e2 Nakamura decides to retreat with the bishop. The other plan is to capture on c6 and play with a quick d2-d4. 12... f8e7 